/*
 * Copyright 1999-2101 Alibaba Group.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.fastjson.serializer;

import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.Type;

/**
 * @author wenshao<szujobs@hotmail.com>
 */
public class ArraySerializer implements ObjectSerializer {

	private final Class<?> componentType;
	private final ObjectSerializer compObjectSerializer;

	public ArraySerializer(Class<?> componentType,
			ObjectSerializer compObjectSerializer) {
		this.componentType = componentType;
		this.compObjectSerializer = compObjectSerializer;
	}

	public final void write(JSONSerializer serializer, Object object,
			Object fieldName, Type fieldType) throws IOException {
		SerializeWriter out = serializer.getWriter();

		if (object == null) {
			if (out.isEnabled(SerializerFeature.WriteNullListAsEmpty)) {
				out.write("[]");
			} else {
				out.writeNull();
			}
			return;
		}
		SerialContext context = serializer.getContext();
		serializer.setContext(context, object, fieldName);



		try {
			out.append('[');
			
			if (!(object instanceof Object[])) {
				int size = Array.getLength(object);
				for (int i = 0; i < size; ++i) {
					if (i != 0) {
						out.append(',');
					}
					Object item = Array.get(object, i);

					if (item == null) {
						out.append("null");
					} else if (item.getClass() == componentType) {
						compObjectSerializer.write(serializer, item, i, null);
					} else {
						ObjectSerializer itemSerializer = serializer
								.getObjectWriter(item.getClass());
						itemSerializer.write(serializer, item, i, null);
					}
				}
			} else {
				Object[] array = (Object[]) object;
				int size = array.length;
				for (int i = 0; i < size; ++i) {
					if (i != 0) {
						out.append(',');
					}
					Object item = array[i];

					if (item == null) {
						out.append("null");
					} else if (item.getClass() == componentType) {
						compObjectSerializer.write(serializer, item, i, null);
					} else {
						ObjectSerializer itemSerializer = serializer
								.getObjectWriter(item.getClass());
						itemSerializer.write(serializer, item, i, null);
					}
				}
			}
	
			out.append(']');

		} finally {
			serializer.setContext(context);
		}
	}
}
